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Abstract: Decoding high complexity is a major issue to design a decode and forward (DF) relay protocol. Thus, the establishment of low complexity decoding system would beneficial to assist decode and forward relay protocol. This paper reviews existing methods for the min-sum based LDPC decoding system as the low complexity decoding system. Reference lists of chosen articles were further reviewed for associated publications. This paper introduces comprehensive system model representing and describing the methods developed for LDPC based for DF relay protocol. It is consists of a number of components: (1) encoder and modulation at the source node, (2) demodulation, decoding, encoding and modulation at relay node, and (3) demodulation and decoding at the destination node. This paper also proposes a new taxonomy for min-sum based LDPC decoding techniques, highlights some of the most important components such as data used, result performances and profiles the Variable and Check Node (VCN) operation methods that have the potential to be used in DF relay protocol. Min-sum based LDPC decoding methods have the potential to provide an objective measure the best tradeoff between low complexities decoding process and the decoding error performance, and emerge as a cost-effective solution for practical application.
Keywords: Decode and Forward, Min-sum, Cooperative communication, LDPC, Variable Node, Check Node
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1. Introduction
Malaysian's mobile market has shown a remarkable growth over the years. The next generation services have since been rolled out and had started having a major impact on the market. Mobile phone usage keeps increasing over the years and people become more mobile [1]. According to World Bank, Malaysia leading Indonesia, Thailand and even United States with 140% mobile penetration which mean 47% Malaysians own more than one mobile phone. New data transfer applications such as download information from internet or sending a video has emerged in mobile phone technology, thus demand higher data rates, high speed data transfer capability and less error rate [2]. In a middle 2015, the total number of cellular subscription according to major mobile operator in Malaysia with Celcom had the largest mobile market about 12.3 million subscribers (31.3%), followed by Maxis with 31% and then Digi with 30%. By November 2015, the number internet users in Malaysia have reached 20.6 million...